bug#53134: org.signal.Signal on flatpak can't execvp xdg-settings

[Alexandre Hannud Abdo]

Ni!

After installing org.signal.Signal with flatpak, `flatpak run 
org.signal.Signal` fails with the message below. I tried adding `xdg-utils` 
(which provides xdg-settings) to my system or my user profile, or to both, to 
no avail. Any ideas? Anyone has Signal Desktop working on Guix? Thanks! ale .~´

$ flatpak run org.signal.Signal

Note that the directories

'/var/lib/flatpak/exports/share'
'/home/eris/.local/share/flatpak/exports/share'

are not in the search path set by the XDG_DATA_DIRS environment variable, so
applications installed by Flatpak may not appear on your desktop until the
session is restarted.

[2 preload-host-spawn-strategy] Running: /app/bin/zypak-helper child - 
/app/Signal/signal-desktop --type=zygote --enable-crashpad
Set Windows Application User Model ID (AUMID) { appUserModelId: 
'org.whispersystems.signal-desktop' }
NODE_ENV production
NODE_CONFIG_DIR /app/Signal/resources/app.asar/config
NODE_CONFIG {}
ALLOW_CONFIG_MUTATIONS undefined
HOSTNAME undefined
NODE_APP_INSTANCE undefined
SUPPRESS_NO_CONFIG_WARNING undefined
SIGNAL_ENABLE_HTTP undefined
userData: /home/bubbles/.var/app/org.signal.Signal/config/Signal
config/get: Did not find user config file (or it was empty), cache is now empty 
object
config/get: Did not find ephemeral config file (or it was empty), cache is now 
empty object
LaunchProcess: failed to execvp:
xdg-settings
LaunchProcess: failed to execvp:
xdg-settings

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